Ashori, A., Hamzeh, Y., Azadeh, E., Izadyar, S., Layghi, M., & Mirfatahi Niaraki, M.S.

Wood Chemistry & Technology 32 (4): 328–341.

2012

In this study, the possible use of canola stalks, which are agricultural residues available in large quantities, for the removal of Remazol Black B (RBB) was investigated. Batch adsorption studies were carried out to examine the influence of various parameters. The results indicated that adsorption was strongly pH-dependent but slightly sorbent dose- and contact time-dependent. The Freundlich and Langmuir ad-
sorption models were used for the mathematical description of adsorption equilibrium and isotherm constants at 25C. Both models were applicable for the description of dye adsorption isotherm in the concentration range studied. However, the Langmuir model showed a higher correlation coefficient than the Freundlich model. According to the Langmuir model, the highest adsorption capacity was found to be 32.8 mg/g. Kinetic models, pseudo-first order and pseudo-second order were employed to describe the adsorption mechanism. The adsorption data followed the pseudo-second order kinetic model with regression coefficient (R2) higher than 0.999. In conclusion, the results showed that canola stalks could be used as a promising and cost-effective biosorbent for treatment of wastewater containing dye.